CVE-2014-9811 in ImageMagick
Summary
by MITRE
The xwd file handler in ImageMagick allows remote attackers to cause a denial of service (segmentation fault and application crash) via a malformed xwd file.
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Analysis
by VulDB Data Team • 10/31/2024
The vulnerability identified as CVE-2014-9811 represents a critical denial of service flaw within ImageMagick's xwd file handler component. This vulnerability specifically targets the X Window System bitmap format processing capabilities of the widely used image manipulation library. The issue manifests when ImageMagick attempts to process malformed xwd files, leading to segmentation faults that ultimately result in application crashes and complete service unavailability. The vulnerability affects numerous systems that rely on ImageMagick for image processing operations, including web applications, content management systems, and server environments that accept user-uploaded images.
The technical flaw stems from insufficient input validation and error handling within the xwd file parser implementation. When processing specially crafted xwd files containing malformed data structures, the parser fails to properly validate header fields and data offsets, causing memory access violations that trigger segmentation faults. This type of vulnerability falls under CWE-125, which describes out-of-bounds read conditions, and CWE-248, which covers unspecified other flaws in the context of improper handling of malformed input data. The vulnerability exploits the fundamental weakness in buffer management and pointer arithmetic within the xwd format handler, where the parser attempts to access memory locations beyond the allocated buffer boundaries.
The operational impact of this vulnerability extends beyond simple service disruption to encompass broader security implications for systems relying on ImageMagick. Remote attackers can exploit this flaw without requiring authentication, making it particularly dangerous in web-facing applications where user uploads are processed. When exploited, the vulnerability can cause cascading failures in applications that depend on ImageMagick for image processing, potentially leading to complete system outages or denial of service for legitimate users. This vulnerability is classified under the ATT&CK technique T1499.004, which involves network denial of service attacks, and represents a classic example of how malformed input can lead to system instability and availability compromise.
Mitigation strategies for CVE-2014-9811 should focus on immediate patching of affected ImageMagick installations, as the vulnerability has been addressed in subsequent releases. Organizations should implement comprehensive input validation measures, including file format detection and sanitization before processing potentially malicious files. Network-level protections such as intrusion detection systems and web application firewalls can help detect and block suspicious file upload attempts. Additionally, implementing sandboxing mechanisms for image processing operations and employing strict file type validation can significantly reduce the attack surface. Regular security audits and vulnerability assessments should include checks for outdated ImageMagick versions, while system administrators should monitor for any signs of exploitation attempts targeting this specific vulnerability. The remediation process should also involve updating all dependent applications and services that utilize ImageMagick to ensure complete protection against similar input validation flaws.